Determining what type of data is in my array

I'm writing a code to deal with a large data set and I'm not so great with Matlab just yet. I've searched, but I'm wondering if there is a function that asks the question "is this a double?" I need to throw out the data points that report NaN. Or is there another way that I can identify those data points?

Answer 1

[Sean de Wolski]

x = [1 nan pi]

x2 = x(~isnan(x))

isnan will be your friend.

Answer 2

[Orion]

use isnan 

A=[1 2 3 nan 5];
isnan(A)

ans =

       0     0     0     1     0

see also isfloat and class

Answer 3

[Kendra Wright]

Excellent. Thank you.